I have a server that has one real ip and a virtual second ip.
Both are connected to the same isp but have different addresses. The plan was one is used for all normall traffic but the second only for mail. This is not working so, when a user sends mail postfix uses the main ip address to send from, this creates an issue as there is someone on the internal network running there own smtp server and sending spam. This results in the main address being blacklisted and our mail server as well. If postfix could simply send mail from the virtual address our issues would be solved as main interface can be blacklisted and wont effect our mail server. Help!?
